Yahoo forced to acknowledge Yahoo Mail problems in worst failure

After a public UI and technical failure with its October redesign, Yahoo Mail miraculously gets worse as it goes. And then, Yahoo acknowledges delivery failures stretching back to November 25.

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Why am I being shamed for 'still' having a Yahoo email address

Yahoo Mail

Yahoo Mail

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Why am I being shamed for 'still' having a Yahoo email address

Emails not delivering to Yahoo (and probably others?)

Why am I being shamed for 'still' having a Yahoo email address

Hackers Target Users with 'Yahoo Account Confirmation' Phishing Email